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Warning: those guides are mostly obsolete, please have a look at the new documentation.

UnixWindowsOracleObsoleteHardwareDIYMechanicsScriptsConfigs

SSH without a password
 
For unices (with the OpenSSH client)
Create a key pair on the client,
cd ~/
mkdir -p .ssh/
chmod 700 .ssh/
cd .ssh/
ssh-keygen -t dsa -P ''
cat id_dsa.pub
copy/paste the public key on the server,
cd ~/
mkdir -p .ssh/
chmod 700 .ssh/
cd .ssh/
vi authorized_keys2
Note. the trailing '2' for SSH protocol 2 only
 
For windows hosts (with the PuTTY client)
Instead of deploying the putty executable alone, use the installer (http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html) which will install all the components. We precisely need puttygen, pageant, putty and eventually plink.
 
Run the puttygen utility to generate a pair of private/public keys,
C:\Program Files\PuTTY\puttygen.exe
select SSH-2 RSA
Generate
Save public key (filename.pub.key)
Save private key (filename.sec.ppk)
note. enter a passphrase if you like
and copy/paste the public key to hosts's,
vi ~/.ssh/authorized_keys2
 
Load your keys with pageant (also remembers the passphrase -- connect once -- if you're using one),
C:\Program Files\PuTTY\pageant.exe
right click on the tray icon > add key (load filename.sec.ppk)
 
Eventually start pageant at boot,
Start menu > Programs > startup (right click / open)
New > shortcut
"C:\Program Files\PuTTY\pageant.exe" c:\path\to\putty.sec.ppk
 
You can now use plink from the command line or batch scripts to do what ever you need e.g.,
"C:\Program Files\PuTTY\plink.exe" root@HOST "shutdown -h -P now"
 
If you use the standard putty gui, eventually save a session with auto-login username,
Connection > data > auto-login username : USERNAME
 
Ref. http://www.ualberta.ca/CNS/RESEARCH/LinuxClusters/pka-putty.html
 

(obsolete, see the new doc)